From 8ec0e742ee265879a5ada93f01b183ea09c79d03 Mon Sep 17 00:00:00 2001
From: Sayamindu Dasgupta <sayamindu@gmail.com>
Date: Sat, 21 Nov 2009 20:00:23 +0000
Subject: Implement erase support

---
diff --git a/icons/tool-eraser.svg b/icons/tool-eraser.svg
new file mode 100644
index 0000000..41fc143
--- /dev/null
+++ b/icons/tool-eraser.svg
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 13.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 14948)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="55px"
+	 height="55px" viewBox="0 0 55 55" enable-background="new 0 0 55 55" xml:space="preserve">
+
+<g id="Eraser" >
+	<g display="inline">
+		<path fill="#FFFFFF" d="M15.621,33.853c-1.1,0-1.424-0.691-0.721-1.536l14.249-17.109c0.704-0.845,2.18-1.537,3.28-1.537h7.805
+			c1.1,0,1.424,0.691,0.721,1.537L26.706,32.316c-0.704,0.845-2.18,1.536-3.28,1.536H15.621z"/>
+		<path fill="#FFFFFF" d="M24.709,41.155c-0.166,1.088-1.2,1.978-2.301,1.978h-8.525c-1.1,0-1.865-0.89-1.7-1.978l0.549-3.62
+			c0.165-1.088,1.2-1.978,2.3-1.978h8.525c1.101,0,1.865,0.89,1.701,1.978L24.709,41.155z"/>
+		<path fill="#FFFFFF" d="M40.446,23.333c-0.189,1.083-0.921,2.662-1.625,3.507L27.471,40.467c-0.705,0.846-1.125,0.65-0.936-0.434
+			l0.646-3.688c0.19-1.083,0.921-2.661,1.626-3.506l11.35-13.627c0.705-0.845,1.125-0.65,0.936,0.434L40.446,23.333z"/>
+	</g>
+</g>
+
+</svg>
diff --git a/scribbleactivity.py b/scribbleactivity.py
index f1e69fd..20e51cb 100644
--- a/scribbleactivity.py
+++ b/scribbleactivity.py
@@ -66,10 +66,22 @@ class ScribbleActivity(Activity):
         rectbtn.connect('toggled', self._rect_cb)
         rectbtn.set_group(circlebtn)
 
+        sep = gtk.SeparatorToolItem()
+        sep.set_expand(False)
+        sep.set_draw(True)
+
+        erasebtn = sugar.graphics.radiotoolbutton.RadioToolButton()
+        erasebtn.set_named_icon('tool-eraser')
+        erasebtn.set_tooltip(_("Erase"))
+        erasebtn.connect('toggled', self._erase_cb)
+        erasebtn.set_group(rectbtn)
+
         toolbar = gtk.Toolbar()
         toolbar.insert(pencilbtn, -1)
         toolbar.insert(circlebtn, -1)
         toolbar.insert(rectbtn, -1)
+        toolbar.insert(sep, -1)
+        toolbar.insert(erasebtn, -1)
 
         sep = gtk.SeparatorToolItem()
         sep.set_expand(True)
@@ -122,6 +134,10 @@ class ScribbleActivity(Activity):
         if button.props.active:
             self._scribblewidget.set_tool('rect')
 
+    def _erase_cb(self, button):
+        if button.props.active:
+            self._scribblewidget.set_tool('eraser')
+
     def export(self, file_path, mimetype, options):
         window = self._scribblewidget.window
         width, height = window.get_size()
diff --git a/scribblewidget.py b/scribblewidget.py
index 3406890..5932a60 100644
--- a/scribblewidget.py
+++ b/scribblewidget.py
@@ -93,6 +93,8 @@ class ScribbleWidget(goocanvas.Canvas):
             self.item = goocanvas.Polyline(parent=self._root, \
                     points=goocanvas.Points(self.line_points), \
                     stroke_color_rgba = self._stroke_color, title=self.item_id)
+        elif self.tool == 'eraser':
+            self.item = self.get_item_at(x, y, True)
         else:
             pass
 
@@ -121,6 +123,10 @@ class ScribbleWidget(goocanvas.Canvas):
                 self.item.props.points = goocanvas.Points(self.line_points)
             self.item_orig_x = x
             self.item_orig_y = y
+        elif self.tool == 'eraser':
+            self.item = self.get_item_at(x, y, True)
+        else:
+            pass
 
         self.prev_time = time
 
@@ -130,7 +136,7 @@ class ScribbleWidget(goocanvas.Canvas):
     def get_cmd_list(self):
         return self.cmd_list
 
-    def process_item_finalize(self):
+    def process_item_finalize(self, x, y):
         if self.tool == 'circle':
             self.cmd = "goocanvas.Ellipse(parent=self._root, center_x=%d, \
                 center_y=%d, radius_x = %d, radius_y = %d, \
@@ -151,6 +157,13 @@ class ScribbleWidget(goocanvas.Canvas):
                 points=goocanvas.Points(%s), stroke_color_rgba = %d, \
                 title = '%s')" % (str(self.line_points), self._stroke_color, \
                 self.item_id)
+        elif self.tool == 'eraser':
+            if self.item is not None:
+                self.item.remove()
+                # Maybe we can use the item title (uuid) and use it instead
+                self.cmd = "self.get_item_at(%f, %f, True).remove()" % (x, y)
+        else:
+            pass
 
         #print self.cmd
 
@@ -182,7 +195,7 @@ class ScribbleWidget(goocanvas.Canvas):
 
     def on_button_release(self, canvas, event):
         canvas.pointer_ungrab(self.item, event.time)
-        self.process_item_finalize()
+        self.process_item_finalize(event.x, event.y)
         return True
 
     def on_motion(self, canvas, event):
--
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